-charles a



(No Model.)

G. A. BAUER.

PITMANOONNBGTIO'N.

,No. 437,276. I Patented Sept. 30. 1890.

HM I AD! F C 2 i l I) I J 2' U a I l I J e d k a ll WITNESSES IJVV'EJVTOR UNITED I STATES PATENT OFFICE.

. CHARLES A. BAUER, OF SPRINGFIELD, OHIO, ASSIGNOR TO THE \VARDER,

BUSHNELL & GLESSNER COMPANY, OF SAME PLACE.

PlTMAN-CON N ECTION.

SPECIFICATION forming part of Letters Patent No. 437,276, dated September 30, 1890.

Application filed J 11118 14, 1890.

To all whom it may concern:

Be it known that I, CHARLES A. BAUER, a citizen of theUnited States, residing at Spring field, in the county of Clark and State of Ohio, have invented certain new and useful Improvements in Pitman-Connections, of which the following is a specification, reference being had therein to the accompanying drawlugs.

This invention relates to certain new and useful improvements in pitman-connections for harvester-knife heads, the purpose or object of the invention being to take up the wear between the parts forming the joint and to lock the nut used on the connecting-bolt against unscrewing in consequence of the vibration and jar of the parts. These objects are carried into practice by the provision of a spring acting to keep the connecting parts in constant intimate contact, and of a nut by which the tension of the spring is regulated, and having a single or double inclined face adapted to the contour of, the body of the spring, the pressure of the spring acting to hold the nut from turning from a matching or adjusted position,the inclines being either in a straight or curved line.

In the accompanying drawings, forming a part of this specification, and in which like reference-letters indicate correspondingparts,

- Figure 1 represents a partial plan and sectional view of portions of a pitman and harvester-knife head with my improvements applied thereto; Fig. 2, a partial plan and sectional view of the pitman in connection with my improvements, and illustrating a modification in the lockin g features.

The letter A designates that part of a harvester-knife head to which the pitman is connected,and the letter B a con'cavo-convex integral cup, the interior of which constitutes a socket. To this socket is smoothly fitted a convex or correspondingly shaped projection C, integral with the pitman D and constituting awrist-pin. The cup is provided with an opening E and the wrist-pin with an opening F, preferably angular in cross-section and enlarged or recessed near the ends. The connecting-boltG is fitted to pass through these openings, clearing the one E and snugly fit- Serial No. 355,483. (No model.)

ting the one F, Where the bolt is of angularcross-section to prevent it from turning.

To the pitman D is secured bya rivetH or a and b in Fig. 1,) forming a single incline, or a the free end occupies a double inclined or oblique position, as shown between the points 0, e, and f in Fig. 2, the inclined or oblique portions being either in a straight or curved line, the latter being preferred and being shown.

Theletter K designates a nut screwed upon the bolt G and having either a single inclined face 9, as shown in Fig. 1,or a double inclined or oblique face It, as shown in Fig. 2, according to the single or double inclination of the spring with which it is to be used. It willbe observed that in either form the inner end or face of the nut and the body of the spring conform substantially to each other, so that the tendency of the nut to unscrew is checked and overcome by the tension of the spring, as the nut cannot turn without increasing this tension. The nut, however, may be manipulated with a wrench and screwed against the spring to increase its tension and draw the cupB and the projection C more strongly to gether, as occasion may require by the Wear of the parts.

By my improvement the joint is kept with its parts in close contact, taking up the wear and avoiding all rattling or pounding and jerking as the pitman passes over the centers, and at the same time the nut is effectually prevented from unscrewing by a cheap and practical means.

The spherical-like formation of the contacting faces of the projection C and the cup B and the freedom of the bolt in the openingE admit of the required amount of universal movementbetween the pitman and the knifehead.

I am aware that it is old to provideaspring connected to a pitman with lugs projecting from its outer face and to combine with such a spring a nut having ratchet-teeth, between which the lug is adapted to fit, whereby the nut is held against rotation or becoming unscrewed, sueh device being set forth and claimed in Letters Patent to lVilliain N. W'hitely for pitman-eonnections for knifeheads, No. 426,485, dated April 29, 1890, such patent being owned by my assignees of the present invention. The difference, however, between such construction and my invention is obvious, since in that device the spring has a lug and the nut has ratchet-teeth, while in mine the spring occupies an oblique position in that part which constitutes the lock, and the nut is fashioned with a correspondinglyoblique face or inner end, which opposes the oblique spring.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a pitman-connection for harveslerknife heads, the combination,with the interinelnbcring parts of the pitman and the knifehead, of a bolt passing through said parts, a spring with its free end occupying an oblique position, and a nut screwed upon the bolt and having an inclined orobliqu 0 face adapted to the spring.

2. In a pitman-connection for harvesterknife heads, the combination, with the intermember-ing parts of the pitman and knife head, of a bolt passing through said parts, a

spring-plate secured to the pitman and occupying at its free end an oblique position, and a nut screwed upon the bolt and having a substantially corresponding inclined or oblique face.

3. In a pitman-connection for harvesterknife heads, the combination, with the intermembering parts of the pitman and knifehead, of a bolt passing through said parts, a spring having adouble inclined or oblique portion, and a nut screwed upon the bolt and having a corresponding double inclined or oblique face adapted to fit against the spring.

l. In a pitman-eonnection for harvesterknife heads, the combination, with the interincmbering parts of the pitman and knifehead, of a bolt passing through said parts, a spring-plate carried by the pitrnan and having its free end bent to form a double inclined or oblique portion, said inclines being on curved lines, and a nut screwed upon the bolt and having a double inclined or oblique face, the inclines being also on curved lines.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES A. BAUER.

Witnesses:

ll. M. PLAISTED, \VA RREN HULL. 

